U.S. Air Force Tech. Sgt. Andres Posada (right), 97th Security Forces Squadron (SFS) kennel master, shows Airman 1st Class Jaylen Bigelow, 97th SFS military working dog handler (MWD), how to train Dex, 97th SFS MWD, in drug detection. MWDs use drug detection skills to search cars, trucks and cargo vehicles at installation entrances and during random building searches. (U.S. Air Force photo by Senior Airman Kayla Christenson)